Malicious PDF — malware analysis report

Static analysis result for SHA-256 15cb4d04e3e531cb…

MALICIOUS

PDF

73.4 KB Created: 2021-09-05 19:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09558bfd72708c36f55550f833f9d692 SHA-1: 31388318628575eae8b1e73299d3996be0122710 SHA-256: 15cb4d04e3e531cbd082eaebca038bc166b656959abe084dac554de5a393f292
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55c963fd90---31286102066.pdf In PDF document text
    • http://tajeer.co/userfiles/file/79694571408.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0a023d4dfe6b2a73380ba2a964c7129c/vopugobolipimiferup.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3900b0dfe---80545838158.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/c45be482c180c202d3bcb41c9d77eccc/pujuvoxubavulazo.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/pupeda.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/4580160543.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/tewodaj.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/wijazujiguvez.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/56279695769.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/34b9fd8cdfbb6f2659b96d1ee174cec8/ziposorukejokuxifavud.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/f5d3eolunqfjamjc36tk7c7sac/wifijivako.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/6322185475.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/52184097633.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9fc39b67569e9ebb40f8d3c86ca7170a/54661717567.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16126cc7dbc0c4---ralef.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/24918652591.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/35461824244.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/52762347671.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/95168857655.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/zovamavelonulakinarobanog.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/f3fcaecb26aa2ab4348deb49e35ecfa7/rizoreda.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/20497321844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=uppercase+letter+worksheetPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF9 16520 bytes
SHA-256: 1ab203fdc4b6aacbc31ad97e95baa917aeeb912309e62708abe4305337b1af84
font_01_sfnt_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 10460 bytes
SHA-256: d8e05ba1b8766006c31d70832d549508768a1d67558b655ef91571fe2b690c14

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